mia-accounting-django/accounting/models.py

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# The accounting application of the Mia project.
# by imacat <imacat@mail.imacat.idv.tw>, 2020/6/29
# Copyright (c) 2020 imacat.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The data models of the accounting application.
"""
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from django.db import models
from django.urls import reverse
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class Subject(models.Model):
"""An accounting subject."""
sn = models.IntegerField(primary_key=True)
parent = models.ForeignKey(
"self", on_delete=models.PROTECT, null=True, blank=True,
db_column="parent_sn")
code = models.CharField(max_length=5)
title_zhtw = models.CharField(max_length=32)
title_en = models.CharField(max_length=128, null=True, blank=True)
title_zhcn = models.CharField(
max_length=32, null=True, blank=True)
created_at = models.DateTimeField(
auto_now_add=True, db_column="created")
created_by_sn = models.IntegerField(
default=923153018, db_column="createdby")
updated_at = models.DateTimeField(
auto_now_add=True, db_column="updated")
updated_by_sn = models.IntegerField(
default=923153018, db_column="updatedby")
def __str__(self):
"""Returns the string representation of this accounting
subject."""
return self.code.__str__() + " " + self.title_zhtw.__str__()
class Meta:
db_table = "accounting_subjects"
ordering = ["code"]
class Transaction(models.Model):
"""An accounting transaction."""
sn = models.IntegerField(primary_key=True)
date = models.DateField(auto_now_add=True)
ord = models.PositiveSmallIntegerField(default=1)
note = models.CharField(max_length=128, null=True, blank=True)
created_at = models.DateTimeField(
auto_now_add=True, db_column="created")
created_by_sn = models.IntegerField(
default=923153018, db_column="createdby")
updated_at = models.DateTimeField(
auto_now_add=True, db_column="updated")
updated_by_sn = models.IntegerField(
default=923153018, db_column="updatedby")
@property
def debit_records(self):
"""The debit records of this transaction."""
return [x for x in self.record_set.all() if not x.is_credit]
@property
def credit_records(self):
"""The credit records of this transaction."""
return [x for x in self.record_set.all() if x.is_credit]
@property
def is_balanced(self):
"""Whether the sum of the amounts of the debit records is the same as the sum of the amounts of the credit
records. """
debit_sum = sum([x.amount for x in self.debit_records])
credit_sum = sum([x.amount for x in self.credit_records])
return debit_sum == credit_sum
@property
def is_cash_income(self):
"""Whether this transaction is a cash income transaction."""
debit_records = self.debit_records
return (len(debit_records) == 1
and debit_records[0].subject.code == "1111"
and debit_records[0].summary is None)
@property
def is_cash_expense(self):
"""Whether this transaction is a cash expense transaction."""
credit_records = self.credit_records
return (len(credit_records) == 1
and credit_records[0].subject.code == "1111"
and credit_records[0].summary is None)
def get_absolute_url(self):
"""Returns the URL to view this transaction."""
if self.is_cash_expense:
return reverse("accounting:transaction", args=("expense", self.sn))
elif self.is_cash_income:
return reverse("accounting:transaction", args=("income", self.sn))
else:
return reverse("accounting:transaction", args=("transfer", self.sn))
def __str__(self):
"""Returns the string representation of this accounting
transaction."""
return self.date.__str__() + " #" + self.ord.__str__()
class Meta:
db_table = "accounting_transactions"
ordering = ["date", "ord"]
class Record(models.Model):
"""An accounting record."""
sn = models.IntegerField(primary_key=True)
transaction = models.ForeignKey(
Transaction, on_delete=models.CASCADE,
db_column="transaction_sn")
is_credit = models.BooleanField()
ord = models.PositiveSmallIntegerField(default=1)
subject = models.ForeignKey(
Subject, on_delete=models.PROTECT, db_column="subject_sn")
summary = models.CharField(max_length=128, blank=True, null=True)
amount = models.PositiveIntegerField()
created_at = models.DateTimeField(
auto_now_add=True, db_column="created")
created_by_sn = models.IntegerField(
default=923153018, db_column="createdby")
updated_at = models.DateTimeField(
auto_now_add=True, db_column="updated")
updated_by_sn = models.IntegerField(
default=923153018, db_column="updatedby")
@property
def debit_amount(self):
"""The debit amount of this accounting record"""
return self.amount if not self.is_credit else None
@property
def credit_amount(self):
"""The credit amount of this accounting record"""
return self.amount if self.is_credit else None
@property
def accumulative_balance(self):
return self._accumulative_balance
@accumulative_balance.setter
def accumulative_balance(self, value):
self._accumulative_balance = value
def __str__(self):
"""Returns the string representation of this accounting
record."""
return self.transaction.date.__str__() + " " \
+ self.subject.title_zhtw.__str__() \
+ " " + self.summary.__str__() \
+ " " + self.amount.__str__()
class Meta:
db_table = "accounting_records"
ordering = ["is_credit", "ord"]